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In: Computer Science

Hi, Java Question and thanks in advance. // TODO once BoundingBox and Draw are implemented, change...

Hi, Java Question and thanks in advance.

// TODO once BoundingBox and Draw are implemented, change Fixtures.simpleCircle
// to Fixtures.complexGroup and test the app on an emulator or Android device


@Override
@SuppressLint("DrawAllocation")
protected void onDraw(final Canvas canvas) {
   final Shape shape = Fixtures.simpleCircle;
   final Location b = shape.accept(new BoundingBox());
   canvas.translate(-b.getX(), -b.getY());
   b.accept(new Draw(canvas, paint));
   shape.accept(new Draw(canvas, paint));
   canvas.translate(b.getX(), b.getY());
}
public class BoundingBox implements Visitor {

   // TODO entirely your job (except onCircle)

   @Override
   public Location onCircle(final Circle c) {
      final int radius = c.getRadius();
      return new Location(-radius, -radius, new Rectangle(2 * radius, 2 * radius));
   }

   @Override
   public Location onFill(final Fill f) {
      return null;
   }

   @Override
   public Location onGroup(final Group g) {

      return null;
   }

   @Override
   public Location onLocation(final Location l) {

      return null;
   }

   @Override
   public Location onRectangle(final Rectangle r) {
      return null;
   }

   @Override
   public Location onStrokeColor(final StrokeColor c) {
      return null;
   }

   @Override
   public Location onOutline(final Outline o) {
      return null;
   }

   @Override
   public Location onPolygon(final Polygon s) {
      return null;
   }
}

mport android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import edu.luc.etl.cs313.android.shapes.model.*;

/**
 * A Visitor for drawing a shape to an Android canvas.
 */
public class Draw implements Visitor {

   // TODO entirely your job (except onCircle)

   private final Canvas canvas;

   private final Paint paint;

   public Draw(final Canvas canvas, final Paint paint) {
      this.canvas = null; // FIXME
      this.paint = null; // FIXME
      paint.setStyle(Style.STROKE);
   }

   @Override
   public Void onCircle(final Circle c) {
      canvas.drawCircle(0, 0, c.getRadius(), paint);
      return null;
   }

   @Override
   public Void onStrokeColor(final StrokeColor c) {

      return null;
   }

   @Override
   public Void onFill(final Fill f) {

      return null;
   }

   @Override
   public Void onGroup(final Group g) {

      return null;
   }

   @Override
   public Void onLocation(final Location l) {

      return null;
   }

   @Override
   public Void onRectangle(final Rectangle r) {

      return null;
   }

   @Override
   public Void onOutline(Outline o) {

      return null;
   }

   @Override
   public Void onPolygon(final Polygon s) {

      final float[] pts = null;

      canvas.drawLines(pts, paint);
      return null;
   }
}

import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import edu.luc.etl.cs313.android.shapes.model.*;
import java.util.*;

/**
 * A Visitor for drawing a shape to an Android canvas.
 */
public class Draw implements Visitor<Void> {

   // TODO entirely your job (except onCircle)

   private final Canvas canvas;

   private final Paint paint;

   public Draw(final Canvas canvas, final Paint paint) {
      this.canvas = canvas; // FIXED
      this.paint = paint; // FIXED
      paint.setStyle(Style.STROKE);
   }

   @Override
   public Void onCircle(final Circle c) {
      canvas.drawCircle(0, 0, c.getRadius(), paint);
      return null;
   }

   @Override
   public Void onStrokeColor(final StrokeColor c) {
      final int x = paint.getColor();
      paint.setColor(c.getColor());
      c.getShape().accept(this);
      paint.setColor(x);
      return null;
   }

   @Override
   public Void onFill(final Fill f) {
      final Style a = paint.getStyle();
      paint.setStyle(Style.FILL_AND_STROKE);
      f.getShape().accept(this);
      paint.setStyle(a);
      return null;
   }

   @Override
   public Void onGroup(final Group g) {
      final Iterator<? extends Shape > shape = g.getShapes().iterator();
      while (shape.hasNext()) {
         shape.next().accept(this);
      }
      return null;
   }

   @Override
   public Void onLocation(final Location l) {
      canvas.translate(l.getX(), l.getY());
      l.getShape().accept(this);
      canvas.translate(-l.getX(), -l.getY());
      return null;
   }

   @Override
   public Void onRectangle(final Rectangle r) {
      canvas.drawRect(0, 0, r.getWidth(), r.getHeight(), paint);
      return null;
   }

   @Override
   public Void onOutline(Outline o) {
      final Style before = paint.getStyle();
      paint.setStyle(Style.STROKE);
      o.getShape().accept(this);
      paint.setStyle(before);
      return null;
   }

   @Override
   public Void onPolygon(final Polygon s) {
      List<? extends Point> points = s.getPoints();
      final float[] pts =
            {
                  points.get(0).getX(), points.get(0).getY(),
                  points.get(1).getX(), points.get(1).getY(),
                  points.get(1).getX(), points.get(1).getY(),
                  points.get(2).getX(), points.get(2).getY(),
                  points.get(2).getX(), points.get(2).getY(),
                  points.get(3).getX(), points.get(3).getY(),
                  points.get(0).getX(), points.get(0).getY(),
            };
      canvas.drawLines(pts, paint);
      return null;
   }
}

* A shape visitor for calculating the bounding box, that is, the smallest
 * rectangle containing the shape. The resulting bounding box is returned as a
 * rectangle at a specific location.
 */
public class BoundingBox implements Visitor<Location> {

   // TODO entirely your job (except onCircle)

   @Override
   public Location onCircle(final Circle c) {
      final int radius = c.getRadius();
      return new Location(-radius, -radius, new Rectangle(2 * radius, 2 * radius));
   }

   @Override
   public Location onFill(final Fill f) {
      return null;
   }

   @Override
   public Location onGroup(final Group g) {

      return null;
   }

   @Override
   public Location onLocation(final Location l) {

      return null;
   }

   @Override
   public Location onRectangle(final Rectangle r) {
      return null;
   }

   @Override
   public Location onStrokeColor(final StrokeColor c) {
      return null;
   }

   @Override
   public Location onOutline(final Outline o) {
      return null;
   }

   @Override
   public Location onPolygon(final Polygon s) {
      return null;
   }
}

Solutions

Expert Solution


@Override
@SuppressLint("DrawAllocation")
protected void onDraw(final Canvas canvas) {
   final Shape shape = Fixtures.simpleCircle;
   final Location b = shape.accept(new BoundingBox());
   canvas.translate(-b.getX(), -b.getY());
   b.accept(new Draw(canvas, paint));
   shape.accept(new Draw(canvas, paint));
   canvas.translate(b.getX(), b.getY());
}

public class BoundingBox implements Visitor {

   // TODO entirely your job (except onCircle)

   @Override
   public Location onCircle(final Circle c) {
      final int radius = c.getRadius();
      return new Location(-radius, -radius, new Rectangle(2 * radius, 2 * radius));
   }

   @Override
   public Location onFill(final Fill f) {
      return null;
   }

   @Override
   public Location onGroup(final Group g) {

      return null;
   }

   @Override
   public Location onLocation(final Location l) {

      return null;
   }

   @Override
   public Location onRectangle(final Rectangle r) {
      return null;
   }

   @Override
   public Location onStrokeColor(final StrokeColor c) {
      return null;
   }

   @Override
   public Location onOutline(final Outline o) {
      return null;
   }

   @Override
   public Location onPolygon(final Polygon s) {
      return null;
   }
}

import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import edu.luc.etl.cs313.android.shapes.model.*;

/**
 * A Visitor for drawing a shape to an Android canvas.
 */
public class Draw implements Visitor {

   // TODO entirely your job (except onCircle)

   private final Canvas canvas;

   private final Paint paint;

   public Draw(final Canvas canvas, final Paint paint) {
      this.canvas = null; // FIXME
      this.paint = null; // FIXME
      paint.setStyle(Style.STROKE);
   }

   @Override
   public Void onCircle(final Circle c) {
      canvas.drawCircle(0, 0, c.getRadius(), paint);
      return null;
   }

   @Override
   public Void onStrokeColor(final StrokeColor c) {

      return null;
   }

   @Override
   public Void onFill(final Fill f) {

      return null;
   }

   @Override
   public Void onGroup(final Group g) {

      return null;
   }

   @Override
   public Void onLocation(final Location l) {

      return null;
   }

   @Override
   public Void onRectangle(final Rectangle r) {

      return null;
   }

   @Override
   public Void onOutline(Outline o) {

      return null;
   }

   @Override
   public Void onPolygon(final Polygon s) {

      final float[] pts = null;

      canvas.drawLines(pts, paint);
      return null;
   }
}

import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import edu.luc.etl.cs313.android.shapes.model.*;
import java.util.*;

/**
 * A Visitor for drawing a shape to an Android canvas.
 */
public class Draw implements Visitor<Void> {

   // TODO entirely your job (except onCircle)

   private final Canvas canvas;

   private final Paint paint;

   public Draw(final Canvas canvas, final Paint paint) {
      this.canvas = canvas; // FIXED
      this.paint = paint; // FIXED
      paint.setStyle(Style.STROKE);
   }

   @Override
   public Void onCircle(final Circle c) {
      canvas.drawCircle(0, 0, c.getRadius(), paint);
      return null;
   }

   @Override
   public Void onStrokeColor(final StrokeColor c) {
      final int x = paint.getColor();
      paint.setColor(c.getColor());
      c.getShape().accept(this);
      paint.setColor(x);
      return null;
   }

   @Override
   public Void onFill(final Fill f) {
      final Style a = paint.getStyle();
      paint.setStyle(Style.FILL_AND_STROKE);
      f.getShape().accept(this);
      paint.setStyle(a);
      return null;
   }

   @Override
   public Void onGroup(final Group g) {
      final Iterator<? extends Shape > shape = g.getShapes().iterator();
      while (shape.hasNext()) {
         shape.next().accept(this);
      }
      return null;
   }

   @Override
   public Void onLocation(final Location l) {
      canvas.translate(l.getX(), l.getY());
      l.getShape().accept(this);
      canvas.translate(-l.getX(), -l.getY());
      return null;
   }

   @Override
   public Void onRectangle(final Rectangle r) {
      canvas.drawRect(0, 0, r.getWidth(), r.getHeight(), paint);
      return null;
   }

   @Override
   public Void onOutline(Outline o) {
      final Style before = paint.getStyle();
      paint.setStyle(Style.STROKE);
      o.getShape().accept(this);
      paint.setStyle(before);
      return null;
   }

   @Override
   public Void onPolygon(final Polygon s) {
      List<? extends Point> points = s.getPoints();
      final float[] pts =
            {
                  points.get(0).getX(), points.get(0).getY(),
                  points.get(1).getX(), points.get(1).getY(),
                  points.get(1).getX(), points.get(1).getY(),
                  points.get(2).getX(), points.get(2).getY(),
                  points.get(2).getX(), points.get(2).getY(),
                  points.get(3).getX(), points.get(3).getY(),
                  points.get(0).getX(), points.get(0).getY(),
            };
      canvas.drawLines(pts, paint);
      return null;
   }
}

* A shape visitor for calculating the bounding box, that is, the smallest
 * rectangle containing the shape. The resulting bounding box is returned as a
 * rectangle at a specific location.
 */
public class BoundingBox implements Visitor<Location> {

   // TODO entirely your job (except onCircle)

   @Override
   public Location onCircle(final Circle c) {
      final int radius = c.getRadius();
      return new Location(-radius, -radius, new Rectangle(2 * radius, 2 * radius));
   }

   @Override
   public Location onFill(final Fill f) {
      return null;
   }

   @Override
   public Location onGroup(final Group g) {

      return null;
   }

   @Override
   public Location onLocation(final Location l) {

      return null;
   }

   @Override
   public Location onRectangle(final Rectangle r) {
      return null;
   }

   @Override
   public Location onStrokeColor(final StrokeColor c) {
      return null;
   }

   @Override
   public Location onOutline(final Outline o) {
      return null;
   }

   @Override
   public Location onPolygon(final Polygon s) {
      return null;
   }
}

hi you did a minor mistake while import graphic canvas you missed letter " i " of import and you have not send the complete code.

venereology answered 4 months ago
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